SpringMVC：底层执行原理分析

秒速五厘米 2023-10-05 08:07 34阅读 0赞

*  声明：原文地址：https://blog.csdn.net/weixin\_44449838/article/details/110006040  
    
    
    ### 文章目录 ###
    
     *  一、流程图展示：
     *  二、底层源码分析
     *   *  Debug 观察执行流程（实现 Controller 接口）
         *   *  1. 准备工作
             *  2 . 开始 debug
         *  Debug 执行流程（使用 @Controller 注解）
         *   *  1 . 准备工作
             *  2 . 开始 Debug

# 一、流程图展示： #

![SpringMVC执行流程图][SpringMVC]

# 二、底层源码分析 #

## Debug 观察执行流程（实现 Controller 接口） ##

### 1. 准备工作 ###

*  有一个简单的 HelloWorld 程序

1.  springmvc-servlet.xml
    
        <?xml version="1.0" encoding="UTF-8"?>
        <beans xmlns="http://www.springframework.org/schema/beans"
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
               xsi:schemaLocation="http://www.springframework.org/schema/beans
               http://www.springframework.org/schema/beans/spring-beans.xsd">
            <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
            <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
            
            <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver">
                
                <property name="prefix" value="/WEB-INF/jsp/"/>
                
                <property name="suffix" value=".jsp"/>
            </bean>
            
            <bean id="/hello" class="controller.HelloController"/>
        </beans>
2.  web.xml
    
        
        <servlet>
            <servlet-name>springmvc</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:springmvc-servlet.xml</param-value>
            </init-param>
            <load-on-startup>1</load-on-startup>
        </servlet>
        <servlet-mapping>
            <servlet-name>springmvc</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
3.  HelloController，这里先用实现 Controller 的方式
    
        public class HelloController implements Controller {
              
            public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
              
                //ModelAndView 模型和视图
                ModelAndView mv = new ModelAndView();
                //封装对象，放在ModelAndView中。Model
                mv.addObject("msg","HelloSpringMVC!");
                //封装要跳转的视图，放在ModelAndView中
                mv.setViewName("hello"); //: /WEB-INF/jsp/hello.jsp
                return mv;
            }
        }
4.  一个简单的 hello.jsp 页面

### 2 . 开始 debug ###

![2020112320023978.png_pic_center][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70_pic_center][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70_pic_center 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70_pic_center 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70_pic_center 3][]

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## Debug 执行流程（使用 @Controller 注解） ##

### 1 . 准备工作 ###

1.  springmvc-servlet.xml
    
        <?xml version="1.0" encoding="UTF-8"?>
        <beans xmlns="http://www.springframework.org/schema/beans"
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
               xmlns:context="http://www.springframework.org/schema/context"
               xmlns:mvc="http://www.springframework.org/schema/mvc"
               xsi:schemaLocation="http://www.springframework.org/schema/beans
               http://www.springframework.org/schema/beans/spring-beans.xsd
               http://www.springframework.org/schema/context
               https://www.springframework.org/schema/context/spring-context.xsd
               http://www.springframework.org/schema/mvc
               https://www.springframework.org/schema/mvc/spring-mvc.xsd">
            <context:component-scan base-package="com.controller"/>
            <mvc:default-servlet-handler />
            <mvc:annotation-driven />
            <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
                  id="internalResourceViewResolver">
                <property name="prefix" value="/WEB-INF/jsp/" />
                <property name="suffix" value=".jsp" />
            </bean>
        </beans>
2.  web.xml
    
        
        <servlet>
            <servlet-name>SpringMVC</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:springmvc-servlet.xml</param-value>
            </init-param>
            <load-on-startup>1</load-on-startup>
        </servlet>
        <servlet-mapping>
            <servlet-name>SpringMVC</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
        <filter>
            <filter-name>encoding</filter-name>
            <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
            <init-param>
                <param-name>encoding</param-name>
                <param-value>utf-8</param-value>
            </init-param>
        </filter>
        <filter-mapping>
            <filter-name>encoding</filter-name>
            <url-pattern>/</url-pattern>
        </filter-mapping>
3.  HelloController
    
        @Controller
        public class HelloController {
              
            @RequestMapping("/hello/{str}")
            public String sayHello(@PathVariable("str") String str,Model model){
              
                System.out.println(str);
                model.addAttribute("msg",str);
                return "hello";
            }
        }

### 2 . 开始 Debug ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ0OTgzOA_size_16_color_FFFFFF_t_70_pic_center 16][]

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